Grinding machine attachment



March 20, 1951 5. J. KoPE 2,545,618

GRINDING MACHINE ATTACHMENT Filed Aug. 17, 1946 2 Sheets-Sheet 1 INVENTOR. F, 1 STANLEY J. KOPEG BY ATTORNEY$ March 20, 1951 5. J. KOPEC GRINDING MACHINE ATTACHMENT '2 Sheets-Sheet 2 Filed Aug. 1'7, 1946 Smaentor STANLEY J. KOPEC (Ittorneg Patented Mar. 20, 1951 {1 Ni TED s TATES EPATEN 'l I) FFICE '-GRINDING HVI 'ACHINE ATTACHMENT Stanley J. :Kopec, Detroit, Mich.

Application August 17, 1946, Serial No. 691,232

2=Glaims. 1 This invention relates generally to grinders and more "particularly to novel means for attachment to a machine for grinding spiral or helical type teeth on a gauge or the like.

Worms and :gears heretofore used in grinding machines have enough irregularities, wear and misalignment to cause grinding of a spiral tooth thinner inpart of the tooth than at other points. These ipriior devices usually-ground the tooth thinnerat the ends thanin the middle. Conventional grinding machines have been tried to grind out spoilage, greatly increased the speed of setup and grinding, and close tolerances are made possible.

It is, accordingly, an object of my invention to provide a grinder for grinding helical teeth and it is more particularly an object of my invention to provide a grinder for helical teeth which is simple in construction, economical in cost, easy to set up, efficient in operation, and operable by a comparatively unskilled operator.

Another object of my invention is to provide an attachment for a grinder for helical teeth which minimizes chances of spoilage.

Another object of my invention is to provide an attachment for a helical tooth grinder upon which measurements may be made in setting up in a minimum of time with sine bars or the like to grind a helical tooth to one ten-thousandths of an inch or less.

Other objects of my invention will become evident from the following detailed description, taken in conjunction with the accompanying drawings, in which Fig. 1 is a side elevational view of a grinder with my novel attachment thereon;

Fig. 2 is a plan view of my novel attachment, with parts broken away;

Fig. 3 is a side elevational view of a lead screw for my novel attachment;

Fig. 4 is a vertical sectional view of the lead screw shown in Fig. 3;

Fig. 5 is a view taken on the line 5-5 of Fig. 2; and

Fig. 6 is a view taken on the line 6-6 of Fig. 2.

Referring now to the drawings, Figs. 1 to 5, inclusive, show a base I having a stationary table 2 and a movable bed 3 longitudinally and traversely movable by means of hand wheels 4 and 5 respectively through conventional gear and rack means (not shown). Abase plate 6 isr'dis-posed on blocks :7 'on the movable bed 3. .Aheadstockel zandaltai'l stock 9 with centers i0 and 2H respectively, vfor holding work l2 are attached to the base :plate 15 by screw bolts l3 and 14 respectively. Ashaft 5 extends longitudinally through the :head stock 8, the center lll andzalso carries a faceplate i6 for engaginga dog Fl toprevent rotation of the work 12 held between the centers llliand 44. {A11 index plate 23 'havingzspa'ced recesses 2.] around the periphery thereof is fixedly attached to the shaft 15. A spring-urged index finger 30 engages the recesses 2! of the index plate and is removed therefrom by a geared lever 3|. The index finger 33 is supported in the laterally extending housing 3!! which is supported on the outer periphery of the housing 32 and it is in axial alignment with an aperture 8| in the side of the casing 32. The index plate 20 is disposed in a housing 32. A lead screw 40 with a helical tooth 41 has a flange 42 on one end thereof attached to the housing 32. A shaft 43 is journalled in support 44 attached to the base plate 6 by screw bolts 45, the shaft 43 extending into a ball bearing assembly 86 shown in Fig. 4. A support 50 is attached to the stationary table 2 by screw bolts 5| and is braced by a brace member 52. Opposed wheels 53 carried by shafts journalled in brackets 55 attached to the support 50 by screw bolts 56 are disposed on each s ide of the tooth 4! on the lead screw 40. A guide bar 60 is disposed parallel to the movable bed 3 by transverse members El and 62 attached to the head and tail stocks 8 and 9 by screw bolts 63 and 64. The guide bar 60 moves between oppositely disposed rollers 65 and 66 on shafts 61 journalled in a head 68 attached to a stationary support 69 secured to the table 2 by screw bolts 1 I.

In operation, a helical tooth 4! of the desired angle is cut on a shaft as shown particularly in Fig. 3 and a flange 42 is secured thereto by welding or any other suitable means for attachment to the housing 32. The opposed rollers 53 are disposed on each side of the tooth 4| and the brackets 55 carrying the rollers 53 are secured to the support 50. The work 12 to be ground is placed between the centers Ill and H and secured by the dog I1. The grinding wheel 10 is adjusted to the desired angle and placed into engagement with one of the teeth of the helically grooved work member l2 and the movable bed 3 is moved longitudinally by the handle 4. The opposed sta' tionary rollers 53 cause the rotation of the shaft l5 and work [2 as the helical tooth 4! passes through the rollers 53. The guide bar 60 passing between the opposing stationary rollers 65 and 66 upon longitudinal movement of the movable bed 3 causes the head stock 8 and tail stock 9 and centers I0 and H to move in an absolutely straight line. The grinding wheel '10 may be mounted on any well known conventional adjustable support now on the market and disclosed in all books relating to gear cutting and grinding machines.

It will be evident from the foregoing that I have provided a very simple means for grinding a helical gear tooth to very close tolerances by a comparatively inexperienced operator.

Various changes may be made in the specific embodiment of my invention without departing from the spirit thereof, or from the scope of the appended claims.

What I claim is:

1. A device of the class described comprising a frame, a grinding wheel mounted on said frame, a headstock and tailstock, a shaft journalled in said headstock, a longitudinally and transversely movable table on said frame supportin said headstock and tailstock, means for moving said table, means for holding a workpiece between said shaft in said headstock and said tailstock, a cylindrical member having a helical tooth of predetermined lead angle rotatable with and attached to the end of said shaft, adjustable opposed wheels disposed on opposite sides of said tooth, a stationar support on said frame supporting said wheels, a U-shaped guide frame having the legs thereof attached to said headstock and said tailstock respectively and the outer frame member thereof parallel to the line of longitudinal movement of said headstock and tailstock, opposed wheels disposed on opposite sides of said outer frame member of said U-shaped frame guiding said guide frame and said headstock and tailstock attached thereto in their longitudinal movement, and a support on said frame supporting said last mentioned wheels, said helical tooth passing between the Wheels engaged therewith upon longitudinal movement of said shaft whereby a workpiece held between said headstock and tailstock is rotated a predetermined amount.

2. A device as set forth in claim 1 wherein an index wheel having circumferentially spaced slots on the periphery thereof is fixedly mounted on said shaft and a spring-urged pin i engageable with said slots whereby said shaft and a workpiece rotatable therewith may be rotated a predetermined amount.

STANLEY J. KOPEC.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,275,218 Calkins Aug. 13, 1918 1,314,154 Scrivenor Aug. 26, 1919 1,669,919 Trbojevich May 15, 1928 2,030,907 Alforo Feb. 18, 1936 

